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IAA300 Product Manual
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Table of Contents
Default Settings ............................................................................................................................ 3
Connections .................................................................................................................................. 3
Standard Span & Zero Adjustment ........................................................................................... 4
Shunt Readings ............................................................................................................................. 5
Switch Configurations ................................................................................................................. 6
Excitation ................................................................................................................................... 6
Polarity ...................................................................................................................................... 7
Gain ............................................................................................................................................ 7
Bandwidth ................................................................................................................................. 8
Shunt .......................................................................................................................................... 8
Advanced Span and Zero Adjustment ................................................................................. 9
Adjusting the Zero ................................................................................................................... 9
Adjusting the Span................................................................................................................... 9
Appendix A (Specifications) ..................................................................................................... 10
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Default Settings
Input Range: +/-2 mV/V
Excitation Voltage: 10 VDC
Output Range: +/-10 VDC
Shunt: 60.4 kΩ
Connections
Sensor Side
Pin
Wiring Code
1
Shield
2
+Excitation1
3
+Signal
4
-Signal
5
-Excitation1
Power Side
Pin
Wiring Code
1
+Vin
2
Ground
3
Shunt
4
+Vout
5
-Vout
6
Shield
WARNING:
Do not connect the device to the power supply
when the power supply is already on!
1 For 6 wire sensors connect +Sense to +Excitation and –Sense to –Excitation
6 Position Screw Terminal
5 Position Screw Terminal
Pin 1
Pin 1
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Standard Span & Zero Adjustment
Once all of the connections are complete, you can begin to set up the sensor/amplifier
system. You will need to have the output from the IAA300 connected to a device so
you can read the voltage.
To set up the system, follow the steps below:
1. Remove any loads on the sensor.
2. Adjust the zero.
3. Apply a known load to the sensor.
4. Allow the sensor to settle.
5. Adjust the span that correlates with that load.
6. Remove the load.
7. Allow the sensor to settle.
8. Readjust the zero if needed.
Ex. If you are applying a full load to the sensor with an excitation voltage of 10 VDC,
then you would want to adjust the output (span) to 10VDC. If you are applying half of
the full load then you would want to adjust the span to exactly half of the maximum.
Once your span is set, check the zero. With no load applied to the sensor, adjust the
zero.
Note: Adjusting the zero and span is done by using a screwdriver to turn the
potentiometers (pots).
Zero
Span
Shunt
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Shunt Readings
Shunt resistors simulate a load on the load cell; thus, allowing for calibration. Follow
the steps below in order to utilize the shunt feature.
1. Determine the value of the shunt resistor needed by using the Shunt Settings
spreadsheet
2. Flip the correct DIP switches to attain the corresponding value
3. Press the Shunt pushbutton
4. While the shunt is enabled and the IAA300 is reading the simulated load, adjust
the span (described above) to the correct output.
Ex. If you are using a 2 mV/V sensor with a 350 Ω bridge and the default 60.4 kΩ
resistor on the IAA300, then the simulated load would be approximately 72% of R.O.
You can then adjust the span to 7.2 VDC to correlate with this simulated load.
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Switch Configurations
To change any of the switch configurations from the default settings, follow the tables
in the next few sections to set your desired configuration. The figure below shows the
default configuration.
excitation
polarity bandwidth
gain
shunt resistors
shunt button
Excitation
There are two excitation values available on the IAA300: 10 VDC (default), and 5 VDC.
To select the excitation, simply flip the DIP switch to the appropriate configuration.
The excitation voltage controls the maximum output of the amplifier.
Ex. If your application requires a lower output voltage than 10 VDC, then the 5 VDC
option is available to use. All you have to do is flip the DIP switch from the DOWN
position to the UP position.
SW1: Excitation (VDC)
UP
5
DOWN
10
1 2 3 4
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Polarity
There are two polarities available on the IAA300: reverse, and straight (default). To
select the polarity, simply flip the DIP switch to the appropriate configuration.
Ex. If you are using your IAA300 with a tension and compression load cell and you
have tension setup as the positive direction, but now you would like to have
compression as the positive direction, all you have to do is flip the DIP switch from the
default polarity position (straight) to the reverse polarity position.
SW2: Polarity
UP
reverse
DOWN
straight
Gain
There are eight gain DIP switches available on the IAA300, ranging from 0.5 mV/V to 10
mV/V. The default setting is configured to 2 mV/V. Select the value closest to your
input range by flipping the DIP switches to the appropriate configuration. Use the Gain
Settings spreadsheet to help you determine which switches to flip.
Ex. If you are using a 2 mV/V sensor with a 5 VDC excitation, then you would want to
use configuration 2 for 1 mV/V. If you are using a 2mV/V sensor with a 10 VDC
excitation then you would want to use configuration 4 for 2 mV/V.
SW3: Sensitivity (mV/V)
1
UP
0.5
5
UP
2.5
DOWN
N/ A
DOWN
N/ A
2
UP
1
6
UP
3
DOWN
N/ A
DOWN
N/ A
3
UP
1.5
7
UP
4
DOWN
N/ A
DOWN
N/ A
4
UP
2
8
UP
10
DOWN
N/ A
DOWN
N/ A
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Bandwidth
There are five bandwidth settings available on the IAA300: 100 Hz, 1 kHz (default), 10
kHz, 25 kHz, and 50 kHz. To select the bandwidth, simply flip the DIP switches to the
appropriate configuration.
Ex. If your application requires a higher bandwidth in order to account for the higher
frequency signals, such as those from dynamic applications, then you would want to
use the 25 kHz or 50 kHz bandwidths.
SW4: Bandwidth2
1
2
3
4
Bandwidth (Hz)
UP
DOWN
DOWN
DOWN
100
DOWN
UP
DOWN
DOWN
1,000
DOWN
DOWN
UP
DOWN
10,000
DOWN
DOWN
DOWN
UP
25,000
DOWN
DOWN
DOWN
DOWN
50,000
Shunt
There are eight shunt DIP switches available on the IAA300, ranging from 30 kΩ to
432 kΩ. The default setting is configured to 60.4 kΩ. Use the online Shunt Settings
spreadsheet to help you determine which switches to flip in order to obtain a desired
output.
2 Refer to page 6 for the switch number
SW5: Shunt (kΩ)
1
UP
30
5
UP
100
DOWN
N/A
DOWN
N/A
2
UP
43.7
6
UP
150
DOWN
N/A
DOWN
N/A
3
UP
60.4
7
UP
300
DOWN
N/A
DOWN
N/A
4
UP
87.6
8
UP
432
DOWN
N/A
DOWN
N/A
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Advanced Span and Zero Adjustment
Adjusting the Zero
At times, when using a signal conditioner, it is necessary to offset the zero. The IAA300
makes this simple. The zero can be adjusted approximately ±10% of R.O. by using the
potentiometer on board.
Adjusting the Span
The input jumpers vary from 0.5 mV/V to 10.0 mV/V. This allows for a large variety of
input ranges. However, it sometimes happens that the rated output from the sensor is
not exactly 2.0 mV/V or 3.0 mV/V. The IAA300 has a ±10% of R.O. adjustment range so
a sensor with an output close to one of the input ranges will work fine.
Drawing Number: EM1023 - 10 -
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Appendix A (Specifications)
Electrical Specifications
Parameter
Min
Typical
Max
Unit
Power Supply
12.5
26
VDC
Current Consumption
100
mA
Output Impedance
10
Ohms
Sensor Impedance
350
5000
Ohms
Bandwidth (Setting 1)
100
Hz
Bandwidth (Setting 2)
1000
Hz
Bandwidth (Setting 3)
10000(1)
Hz
Bandwidth (Setting 4)
25000(2)
Hz
Bandwidth (Setting 5)
50000(3)
Hz
Common Mode Rejection Ratio
120
dB
Noise
2
mVp-p
Output Span Range
-10
10
% of FSR
Output Zero Range
-10
10
% of FSR
Gain Drift with Temperature
-25
X
25
PPM of FSR
Internal Non-Linearity
-0.01
X
0.01
% of FSR
Zero Drift with Temperature
-25
X
25
PPM of FSR
1 Only for Sensitivity of 1.0 mV/V or Greater
2 Only for Sensitivity of 1.5 mV/V or Greater
3 Only for Sensitivity of 1.5 mV/V or Greater
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